156 ARTHUR: NEW SPECIES OF UREDINEAE 
naked, cinnamon-brown, somewhat pulverulent, ruptured epi- 
dermis evident; urediniospores broadly obovate, or spatulate- 
obovate, flattened or concave on one side, 20-26 by 26-32 u; wall 
cinnamon-brown, uniformly thick, 1.5-2 4, sparsely and noticeably 
echinulate except on concave side which is smooth, with one pore 
on concave side, subequatorial, sometimes near hilum. 
On Geranium mexicanum H.B.K., Amecameca, Mexico, 
October 6, 1900, E. W. D. Holway. A unique form on account of 
the spore having a smooth, concave side, bearing the single pore. 
PuRDUE UNIVERSITY, 
LAFAYETTE, INDIANA 
